jennifer graves is josh powell's sister. >> josh's reaction was, don't talk to anybody. don't even talk to family. just get out. >> reporter: and what does that say to you? >> it says to me that he's done something. >> reporter: do the scenarios play through your mind? >> absolutely. >> reporter: and what do you think? >> you know, has he kip napped her? is he holding her somewhere? killed her? who knows? >> it has to be hard to say that about your own brother. >> it is difficult. but you have to remember that she was my sister. and she's gone. she's my friend. where is she? haven't seen her for eight months. >> it's our understanding that if they divorced, that she was not going to get the children. that he would cause her physical bodily harm. >> reporter: susan feared this? >> she feared for her personal safety. >> reporter: within a month of susan's disappearance, josh powell packs up and moves his family 900 miles away to washington state. to the home of his father, steven. why would susan not want that? >> she was uncomfortable about that part of his family that li